Specifications

APPENDIX A: EXTERNAL ANALOG PROGRAMMING
The voltage and current outputs of the PD series can be programmed by an external analog voltage.
The outputs are linearly proportioned to an external input voltage from 0 to 10 volts. The external
analog programming mode is activated by setting these parameters via the front panel or GPIB bus,
VSET to 0V, ISET to a proper value for CV operation, or setting ISET to 0A and VSET to a proper
value for CC operation.
To control the output voltage with the analog programming mode requires the following procedure:
apply the external 0 to 10V source (Xv) between Pin-2 (positive) and Pin-1 (common). These input
terminals are located at the rear of the power supply.
The output voltage is derived by the following equation:
Vout = x
v
V max
10
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¨
¨
·
¹
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Variable Definition
Vout Voltage requirement
Xv External voltage
Vmax Rated maximum output voltage
To control the output current with the analog programming mode requires the following procedure,
apply the external 0 to 10V source (Xv) between Pin-4 (positive) and Pin-1(common).
The output current is derived by the following equation:
Iout = x
v
axIm
10
§
©
¨
¨
·
¹
¸
¸
Variable Definition
Iout Current requirem ent
Xv External voltage
Imax Rated maximum output current
To control both voltage and current simultaneously in the external programming method requires
that the user apply two separately isolated 0 to 10V supplies.
NOTES: The V and I terminals are at a negative sense potential; with this in mind do not connect
them to any other terminal on the rear panel. This precaution will prevent permanent damage to the
power supply!
External analog programming port
Pin-# assignment I/O function
1 Return (-) output Ext. V/I Prog.
(-)
2 Voltage
Prog.
output Ext. Vprog. (+)
3 N/A N/A N/A
4 Current Prog. output Ext. Iprog. (+)
5 N/A N/A N/A
6 N/A N/A N/A
7 N/A N/A N/A
8 N/A N/A N/A
9 N/A N/A N/A
A
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