Instruction manual

Figure 3.3.3.1 Voltage Channel External Gain Select
In normal operation, there are jumpers between TB1-7 and TB1-8, TB1-9 and
TB1-10. This jumper configuration makes the OP-AMP and INVERTING
amplifier with a gain of -1.
To change the gain of the amplifier, remove the link between TB1-7 and TB1-8
and insert an external resistor between TB1-7 and TB1-8. The gain can be
represented by the formula:
Gain =
External Re sistor +10K
10K
The output of the preamplifier must not exceed ±10 Volts which is the full scale
output voltage. Exceeding the ±10V will cause the limit circuit to activate.
NOTE:
These rear panel terminals are not intended for use as external
programming inputs. Damage to the power supply may
result from such an attempt.
3.4 CURRENT CHANNEL OPERATION
Important:
Always connect a load to the output when in the
CURRENT MODE OF OPERATION. An open circuit in the
CURRENT MODE may result in high frequency oscillation.
For constant current regulation, switch the V/I switch to I. the CURRENT INT/EXT
switch to INT. The current may now be adjusted by the front panel CURRENT
CONTROL POTENTIOMETER. Clockwise rotation causes positive current,
counterclockwise causes negative current.
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83-469-001 Rev. B