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4.4.11 Output Voltage Programming by external voltage
Fig. 4-7 shows the set-up for external voltage programming of the output voltage. A voltage source
variable from 0 to 4V, programs the output voltage proportionally from zero to full scale. The static load
current on the programming source is less than 2uA. The source resistance should be less than
10Kohm to avoid degradation of offset and drift specifications. When external voltage is used for
programming the front panel and the computer control (via the serial communication) are disabled.
Note: Full scale is 105% of the rated output voltage.
External control connector
_
0~4VDC
Voltage
source
+
4.4.12 Output Current Programming by external voltage
Fig. 4-8 shows the set-up for external voltage programming of the output current. A voltage source
variable from 0 to 4V, programs the output current proportionally from zero to full scale. The static load
current on the programming source is less than 2uA. The source resistance should be less than
10Kohm to avoid degradation of offset and drift specifications.
Note: Full scale is 105% of the rated output current.
External control connector
_
0~4VDC
Voltage
source
+
The Com pin at the external control connector is connected to the -Sense potential. NEVER
connect the Com pin (pin10) to any potential, as it may damage the power supply.
Avoid connection of resistors greater than 4kohm or voltage greater than 4V for external resistor
or voltage programming, as it may cause the output voltage and current to exceed the power
supply rating. The display will NOT show the actual voltage and current when such resistor
13
14
- S
- LS
+S
+LS
On/Off
COM
P
Output Good
VCVP
VRFV
VCCP
VRFI
RCVP
RCCP
1
2
13
14
- S
- LS
+S
+LS
On/Off
COM
P
Output Good
VCVP
VRFV
VCCP
VRFI
RCVP
RCCP
2
1
CAUTION
CAUTION
or voltage is applied for programming.
Fig. 4-7:
Output voltage programming
by external voltage source.
(ZUP rear panel view)
Fig. 4-8:
Output current programming
by external voltage source.
(ZUP rear panel view)
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