NHQ x0xx_AIO - FAST ComTec
NHQ x0xx_AIO
Precision NIM High Voltage Supply NHQ STANDARD series
RS232 Interface
Operators Manual
Contents:
1. General information
2. Technical Data
3. NHQ Description
4. Front panel
5. Handling
6. RS232 Interface
7. Program example
8. CE Certificate
Appendix A: Block diagram
Appendix B: Rotary switch locations
Attention!
-It is not allowed to use the unit if the covers have been removed.
-We decline all responsibility for damages and injuries caused by an improper use of the
module. It is highly recommended to read the operators manual before any kind of
operation.
Note
The information in this manual is subject to change without notice. We take no responsibility for any error in the
document. We reserve the right to make changes in the product design without reservation and without
notification to the users.
Filename NHQx0x_AIO_01_FAST.___; Version 2.04 as of 06.04.98
FAST ComTec Communication Technology GmbH
Gruenwalder Weg 28a
D - 82041 Oberhaching
Germany
Phone ++ 49 (0) 89 / 66 51 80 0
Fax
++ 49 (0) 89 / 66 51 80 40
E-mail: info@fastcomtec.com
http://www.fastcomtec.com
2
FAST ComTec Communication Technology GmbH
Gruenwalder Weg 28a
D - 82041 Oberhaching
Germany
Phone ++ 49 (0) 89 / 66 51 80 0
Fax
++ 49 (0) 89 / 66 51 80 40
E-mail: info@fastcomtec.com
http://www.fastcomtec.com
1. General information
The NHQ x0xx_AIO is a one or two channel NIM High Voltage PS. The unit is 1 slot wide and offers either
manual control and remote control via RS232 Interface or analogue I/O. Remote control is also optionally
available via the CAN-Bus interface according to the CAN specification 2.0 A. The use of remote control
interfaces extended functionality compared to manual control.
The high voltage supply provides high precision output voltage together with very low ripple and noise even
under full load. Separate 10%-steps hardware switches set voltage and current limits. An INHIBIT input protects
sensitive devices which are connected to the output. The maximal output current per channel is also
programmable via the interface. The high voltage output is protected against overload and short circuit. The
output polarity can be switched. The HV-GND is connected to the chassis and the powering GND.
2. Technical Data
NHQ - one channel
102M_AIO
103M_AIO
104M_AIO
105M_AIO
106L_AIO
- two channel
202M_AIO
203M_AIO
204M_AIO
205M_AIO
206L_AIO
Output voltage Vout
0 .. 2 kV
0 ... 3 kV
0 ... 4 kV
0 ... 5 kV
0 ... 6 kV
Output current Iout
0 ... 6 mA
0 ... 4 mA
0 ... 3 mA
0 ... 2 mA
0 ... 1 mA
NHQ 206L_AIO
2 x 6 kV / 1 mA
with option 104 ( M ⇒ L): max 100 µA
Ripple and noise
typ.
< 0,5 mVpp
< 2 mVpp
< 1 mVpp
< 2 mVpp
< 2 mVpp
max.
2 mVpp
4 mVpp
2 mVpp
5 mVpp
5 mVpp
LCD Display
4 digits with sign, switch controlled
-voltage display in [V], -current display in [µA]
Resolution of
voltage measurement
current measurement
Accuracy
Stability
1V
1 µA, with option 104: 100 nA at Iout max ≤ 100 µA
voltage
± (0,05% Vout + 0,02% Vout max + 1 digit)
for one year
current
± (0,05% Iout + 0,02% Iout max + 1 digit)
for one year
∆ Vout / VINPUT
< 5 ∗ 10
∆ Vout
< 5 ∗ 10-5 (idle to max. load)
Temperature coefficient
Voltage control
-5
< 5 ∗ 10-5/K
CONTROL switch in:
upper position - manual: 10-turn potentiometer,
lower position
- DAC: control via interface (ex works)
internal switchable to control via analogue I/O (extDAC)
NHQ x02_AIO – x04_AIO: VSET/MON = VOUT / 400
NHQ x05_AIO – x06_AIO: VSET/MON = VOUT / 1000
Please use all channels via interface or analogue I/O always!
Rate of change of
- HV -ON/OFF (hardware ramp):
500 V/s
Output voltage
- control via interface (software ramp): 2 - 255 V/s
Protection
- separate current and voltage limit
(hardware, rotary switch in 10%-steps),
- INHIBIT (external signal, TTL-level, Low active),
- programmable current limit (software)
Power
VINPUT
requirements
Operating temperature
Storage temperature
± 24 V (< 800 mA, one channel < 400 mA),
± 6 V (< 100 mA), with option N24: only ± 24 V
0 . . . 50 °C
-20 . . . +60 °C
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Gruenwalder Weg 28a
D - 82041 Oberhaching
Germany
Phone ++ 49 (0) 89 / 66 51 80 0
Fax
++ 49 (0) 89 / 66 51 80 40
E-mail: info@fastcomtec.com
http://www.fastcomtec.com
3
NHQ - one channel
102M_AIO
103M_AIO
104M_AIO
105M_AIO
106L_AIO
- two channel
202M_AIO
203M_AIO
204M_AIO
205M_AIO
206L_AIO
Packing
NIM Standard chassis: NIM 1/12
Connector
NIM: 5-pin; Interface: 9-pin female D-Sub
analogue I/O: VSET 1-pin Lemo-hub on rear side
VMON 1-pin Lemo-hub on rear side
HV connector
SHV-Connector on rear side,
optional Radiall connector R316 553
INHIBIT connector
1-pin Lemo-hub on front side
3. NHQ Description
The function is described in a block diagram of the NHQ xxx , see Appendix A.
High voltage supply
A patented high efficiency resonance converter circuit, which provides a low harmonic sine voltage on the HVtransformer, is used to generate the high voltage. The high voltage is rectified by using a high speed HVrectifier, and the polarity is selected via a high-voltage switch. A consecutive active HV-filter damps the
remaining distortion and ensures low ripple and noise values as well as the stability of the output voltage. A
precision voltage divider is integrated into the HV-filter to provide the set value of the output voltage, an
additional voltage divider provides the measuring signal for the maximum voltage control. A precision
‘Measuring and AGC amplifier’ compares the actual output voltage with the set value given by the DAC
(computer control) or the ten turn pot (manual control). Signals for the control of the resonance converter and
the stabiliser circuit are derived from the result of the comparison. The two-stage layout of the control circuit
results in an output voltage, stabilised to very high precision to the set point.
Separate security circuits prevent that the front-panel switch settings for the current Imax and voltage Vmax limits
could be exceeded. A monitoring circuit prevents malfunction caused by low supply voltage.
The internal error-detection-logic evaluates the corresponding error signals and the external INHIBIT signal. It
also allows the detection of short-over-current due to single flashover.
Digital control unit
A micro controller handles the internal control, evaluation and calibration functions for both channels. The actual
voltages and currents are read cyclically by an ADC, connected by a multiplexer and processed to be displayed
on the 4 digit LCD. The current and voltage hardware limits are retrieved cyclically several times per second.
The reference voltage source provides a precise voltage reference for the ADC and generates the control
signals in the manual operation mode.
In remote control the set values for the corresponding channels are generated by a 16-Bit DAC.
Filter
A special quality of the unit is a tuned filtering concept, which prevents the unit against electromagnetic
interference and also the irradiation of the module to the outside world. A filtering network is located close to the
connectors of the supply voltage and the converter circuits of the individual devices are also protected by filters.
The high-voltage filters are housed in individual metal enclosures to shield even against minimum irradiation.
4
FAST ComTec Communication Technology GmbH
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D - 82041 Oberhaching
Germany
Phone ++ 49 (0) 89 / 66 51 80 0
Fax
++ 49 (0) 89 / 66 51 80 40
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http://www.fastcomtec.com
4. Front panel
[1]
4 digit LCD display
[2]
Channel switch
[3]
Measuring switch
[4]
Rotary switch Voltage limit
[5]
Rotary switch Current limit
[6]
Error indicator
[7]
10 - turn potentiometer
[8]
HV-On indicator
[9]
HV-On switch
[10]
Control switch
[11]
Polarity indicator
[12]
KILL switch
[13]
INHIBIT input
5. Handling
The NIM connector, the Sub-D-9 connector for the interface and the SHV High voltage output connector is on
the rear side of the unit.
The output polarity is selected with help of the rotary switch on the cover side (see appendix B). The chosen
polarity is displayed on the LED [11] on the front panel and also as a sign on the LCD display [1].
Attention!
It is not allowed to change the polarity under power!
An undefined switch setting (not at one of the end positions) will cause no output voltage.
The High Voltage output is switched to on with HV-ON switch [9] at the front panel. The yellow LED [8] is
flashing if the units works well.
Attention!
If the CONTROL switch [10] is in upper position (manual control), the high voltage is
generated at the HV-output connector on the rear side with a ramp speed of 500 V/s
(hardware ramp) to the set voltage chosen via the 10-turn potentiometer [7].
This is also the same, if the unit is switched from interface control to manual control.
If the CONTROL switch [10] is in lower position (DAC) the high voltage will be activated only after receiving
corresponding interface commands if control via digital interface is active (internal switch to intDAC on all
channels).
Attention!
If the ‘Autostart’ mode has been activated during the most recent operation then the
output voltage will be generated following the herewith stored parameters.
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Phone ++ 49 (0) 89 / 66 51 80 0
Fax
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5
If control via analogue I/O is active (internal switch to extDAC on all channels), high voltage will be activated
only corresponding to the analogue set voltage VSET.
Output voltage in [V] or output current in [µA] will be displayed on the LCD [1] depending on the position of the
Measuring switch [3].
Channel switch [2] is to select which channel will be displayed, channel (A) or channel (B).
During manual control (CONTROL switch [10] to potentiometer), the output voltage can be set via the 10-turn
potentiometer [7] in a range of 0 to the maximum voltage.
If CONTROL switch [10] is switched to DAC, the DAC takes over the previous output voltage setting of the
manual control. Via the interface the output voltage can be generated under a programmable ramp speed
(software ramp) of 2 to 255 V/s in a voltage range of 0 to the maximum voltage.
A programmable current trip for the maximum allowed output current per channel can be set with the maximum
possible resolution of the current measurement. If the output current exceeds the programmed limit, the output
voltage will be shut off permanently by the software. Restart the voltage is possible after ”Read status word”
and then ”Start voltage change” via serial interface. If ”Auto start” is active, ”Start voltage change” is not
necessary.
The maximum output voltage and current can be selected in 10%-steps with the rotary switches Vmax [4] and Imax
[5] (switch dialled to 10 corresponds to 100%) independently of programmable current trip. The case where the
output voltage or current will exceed the limits will be displayed by the red error LED on the front panel [6].
Function of the KILL switch [12]:
Switch to the right position: The output voltage will be shut off permanently without ramp on exceeding Imax or
(ENABLE KILL)
in the presence of an INHIBIT signal (Low=active) on the INHIBIT input [13]. The
restart of the output voltage is possible after using the switches HV-ON [9] or
KILL [12] or during remote control ”Read status word” and then ”Start voltage
change”. If ”Auto start” is active, ”Start voltage change” is not necessary.
Note:
If any capacitance is connected to the HV-output or if the rate of change of the
output voltage is high (hardware ramp) at high load, then the KILL function will be
released due to the current which is charging this capacitor. In this case a slower
rate of output change (software ramp) is recommended or ENABLE KILL should
not be selected before the output voltage has arrived the set voltage.
Switch to the left position: The output voltage will be limited to Vmax, and the output current to Imax .; INHIBIT
shuts the output voltage off without ramp. The previous voltage setting will be
(DISABLE KILL)
reset together with hard or software ramp if INHIBIT is no longer present.
6. RS232 interface
The most important parameters of the high voltage supply can be set and read under computer control via the
RS232 interface with internal switch to intDAC on all channels
RS232 control mode
1st Write function:
2nd Switch function:
3rd Read function:
set voltage; ramp speed; maximal output current (current trip); auto start
output voltage = set voltage, output voltage = 0
set voltage; actual output voltage; ramp speed; actual output current;
current trip; auto start ; hardware limits current and voltage; status
Front panel switches i.e. manual control is on higher priority compared to software control.
Manual control mode
During manual control , RS232 read cycles are interpreted only. Commands are accepted, but do not result into
a change of the output voltage.
6
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D - 82041 Oberhaching
Germany
Phone ++ 49 (0) 89 / 66 51 80 0
Fax
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E-mail: info@fastcomtec.com
http://www.fastcomtec.com
Specification RS232 interface
The data exchange is character based, synchronisation between the computer and the unit interface input is
performed by using echo. The data transfer to the computer (output) is asynchronous, breaks between two
characters and the programming of the break time allows the computer to receive and evaluate the incoming
data. Break time has been set to 3 ms at the factory.
The hardware setting of the RS232 interface is 9600 bit/s, 8 bit/character, no parity, 1 stop bit.
Signal transmission is performed indirect coupled via the RxD and TxD, relative to GND.
The interface is on a 9 pin female D-Sub connector, the connection can be set up using a 1:1 extension cord
(no null modem cable) if a PC is connected. The pin assignment is given in table 1. Control signals which
should be bridged on the PC side if a three-conductor cable is used, are given in table 1 .
Table 1:
Signal pin assignment
Signal
RS 232
RxD
TxD
GND
HV-supply
DSUB9
2
3
5
4
6
8
Int.
─┐
─┤
─┘
PC
DSUB9
2
3
5
4
6
8
PC
DSUB25
3
2
7
20
6
5
Connection
3-lead cable
─┐
─┤
─┘
Syntax
The commands are transmitted in ASCII. The end of command is formed by the sequence <CR> <LF>
( 0x0D 0x0A , 13 10 respectively). Leading zeroes can be omitted on input, output is in fixed format.
At first a <CR><LF> has to be sent in order to synchronise the computer and the unit.
Command set
command
Computer
HV-supply
Read module identifier
#*
# * nnnnnn
; n.nn
;U
;I*
(unit number ; software-rel. ; Vout max ; Iout max )
Read break time
Write break time
Read actual voltage channel 1
Read actual current channel 1
Read voltage limit channel 1
Read current limit channel 1
Read set voltage channel 1
Write set voltage channel 1
Read ramp speed channel 1
Write ramp speed channel 1
Start voltage change channel 1
Write current trip cannel 1
Read current trip channel 1
Read status word channel 1
Read module status channel 1
Write auto start channel 1
Read auto start channel 1
W*
W=nnn *
U1 *
I1 *
M1 *
N1 *
D1 *
D1=nnnn *
V1 *
V1=nnn *
G1 *
L1=nnnn *
L1 *
S1 *
T1 *
A1=nn *
A1 *
W * nnn *
(break time 0 ... 255 ms)
W=nnn * *
(break time = 0 - 255 ms)
U1 * {polarity / voltage} *
(in V)
I1 * {mantisse / exp. with sign} *
(in A)
M1 * nnn *
(in % of Vout max)
N1 * nnn *
(in % of Iout max)
D1 * {voltage} *
(in V)
D1=nnnn * *
(voltage in V; <M1)
V1 * nnn *
(2 ... 255 V/s)
V1=nnn * *
(ramp speed = 2 - 255 V/s)
G1 * S1=xxx *
(S1 , ⇒ Status information)
L1=nnnn * *
(corresponding current resolution > 0)
L1 * nnnn *
(s.a., for nnnn=0 ⇒ no current trip)
S1 * xxx *
(S1 , ⇒ Status information)
T1 * nnn *
(code 0...255, ⇒ Module status)
A1=nn * *
(conditions ⇒ Auto start)
A1 * n *
(8 ⇒ auto start is active; 0 ⇒ inactive)
* = <CR><LF>
The second channel of the supply is addressed by replacing 1 with 2 !
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Phone ++ 49 (0) 89 / 66 51 80 0
Fax
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7
Status information:
xxx:
ON<SP>
OFF
MAN
ERR
INH
QUA
L2H
H2L
LAS
TRP
Output voltage according to set voltage
Channel front panel switch off
Channel is on, set to manual mode
Vmax or Imax is / was exceeded
Inhibit signal was / is active
Quality of output voltage not guaranteed at present
Output voltage increasing
Output voltage decreasing
Look at Status (only after G-command)
Current trip was active
If the output voltage has been shut off permanently (by ERR or INH at ENABLE KILL or TRP) you must write
”Read status word” before it is possible to restart the output voltage again.
Error codes:
????
?WCN
?TOT
?<SP>UMAX=nnnn
Syntax error
Wrong channel number
Timeout error (with following re-initialisation)
Set voltage exceeds voltage limit
Module status:
Status
Description
Bit
value
QUA
Quality of output voltage not given at present
7=1
128
Vmax or Imax is / was exceeded
ERR
8
INH
INHIBIT signal
KILL_ENA
KILL-ENABLE is
OFF
Front panel HV-ON switch in
POL
Polarity set to
MAN
Control
T1:
U/I
Display dialled to
T2:
A/B
Channel dialled to
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6=1
64
was / is active
inactive
5=1
32
0
on
off
4=1
16
0
OFF position
ON position
3=1
8
0
positive
negative
2=1
4
0
manual
via RS 232 interface
1=1
2
0
voltage measurement
current measurement
channel A
channel B
0=1
1
0
1
0
0=1
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Auto start:
Description
Bit
If the Auto start conditions ( status: OFF + ERR + INH + MAN = 0 ) are made then the 3=1
output voltage of the channel is ramping to the set voltage, i.e. G-command is after Dcommand, POWER-ON and OFF ⇒ ON not necessary.
value
8
If the output voltage has been shut off permanently because Vmax or Imax has been
exceeded or by ERR or INH ( ENABLE KILL or TRP), the previous voltage setting will
be reset with software ramp after ”Read status word”.
values loaded into corresponding
Current trip saving in EEPROM
2=1
4
registers at POWER-ON!
Set voltage saving in EEPROM
1=1
2
Ramp speed saving in EEPROM
0=1
1
(EEPROM guarantee 1 million saving cycles)
Software
Contact us for an overview for our user friendly control and data acquisition software!
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Germany
Phone ++ 49 (0) 89 / 66 51 80 0
Fax
++ 49 (0) 89 / 66 51 80 40
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9
7. Program example
/***************************************************************************************************/
/*
/*
nhq.cpp
/*
/*
example program for iseg nhq hv boards, written by Jens Römer, 27.2.97
/*
/*
this code was compiled under BC, please contact iseg for the source file
/*
/***************************************************************************************************/
#include <dos.h>
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include "int14.h"
const
const
const
unsigned
unsigned
unsigned
unsigned
int
boolean
etx= 0x03;
f = 0x0a;
cr = 0x0d;
char readU[]={'U','1',cr,lf,etx};
char sendU[]={'D','1','=','1','0',cr,lf,etx};
char *ptr;
char rby;
i, cnt;
ok;
void main(void)
{
clrscr();
COM2_init();
COM2_set(9600);
ok=True_;
ptr=readU;
for (;;)
{
if (*ptr==etx) break;
COM2_send(*ptr);
rby=COM2_read();
if (rby!=*(ptr++)) ok=False_;
else switch (rby)
{
case lf : printf("%c",lf); break;
case cr : printf("%c",cr); break;
default : printf("%c",rby); break;
}
if (ok==False_)
{
printf("No coincident read data found!");
exit(1);
}
}
cnt=8;
do
{
rby=COM2_read();
switch (rby)
{
case lf : printf("%c",lf); break;
case cr : printf("%c",cr); break;
default : printf("%c",rby); break;
}
cnt--;
} while (cnt>=1);
}
10
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*/
*/
*/
*/
*/
*/
*/
// COM2 handling
//read voltage
//set voltage to 10V
// COM2:
9600 baud, 8 databits, no parity, 1 stopbit
//send one byte
//read one byte
//compare sent with read data
//read voltage data
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8. CE Certificate
Copy of CE - Certificate
This is to certify that the manufacturer
iseg Spezialelektronik GmbH
Bautzner Landstr. 23
D - 01454 Radeberg / Rossendorf
Germany
guaranties the compliance to the following:
VDE 0843 Part 3 / 02.88
VDE 0875 Part 11 / 07.92
VDE 0877 Part 1 / 03.89
EN 50082-2 / 02.96
ENV 50140 / 02.95
EN 61000 Part 4-2 / 03.96
EN 61000 Part 4-4 / 03.96
EN 61000 Part 4-6 / 04.97
EN 61000 Part 4-8 / 05.94
for the precision high voltage power supplies
of the NHQ STANDARD – Series.
Rossendorf, dated 30.09.98
Signed for
Dr. Frank Gleisberg
Managing director
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Gruenwalder Weg 28a
D - 82041 Oberhaching
Germany
Phone ++ 49 (0) 89 / 66 51 80 0
Fax
++ 49 (0) 89 / 66 51 80 40
E-mail: info@fastcomtec.com
http://www.fastcomtec.com
11
Appendix A:
12
Block diagram NHQ
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Germany
Phone ++ 49 (0) 89 / 66 51 80 0
Fax
++ 49 (0) 89 / 66 51 80 40
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NHQ mit Voutmax bis zu 5kV /
NHQ with Voutmax up to 5kV
POLARITY
NEG
A
Umschalten von neg. zu pos. /
switch from neg. to pos.
POS
Umschalten von pos. zu neg. /
switch from pos. to neg.
NEG
B
POS
NHQ mit Voutmax > 5kV /
NHQ with Voutmax > 5kV
POLARITY
A
NEG
POS
Umschalten von neg. zu pos. /
switch from neg. to pos.
B
NEG
POS
Umschalten von pos. zu neg. /
switch from pos. to neg.
Appendix B:
NHQ side cover,
e.g.:
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Polarity rotary switch
channel A, polarity negative
channel B, polarity positive
Phone ++ 49 (0) 89 / 66 51 80 0
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13
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