JQE SPECIAL SVC 092611
3-7/(3-8 Blank)
Volt which can then be used to program a specific output voltage based on a specific resistance
of the external variable resistor.
To set an output voltage using an external programming resistor, proceed as follows:
1. Determine value of programming resistor(s) for output voltage desired.
2. Using two-wire, shielded cable, connect the chosen resistors to terminals 4 and 6 at ter-
minal block TB501 on the rear panel. Connect the shield to the GND terminal of the JQE
Special.
3. The output voltage (Volts) will be I
b
(mA) x R
VC
(KOhms), (where
FIGURE 3-5. REMOTE RESISTANCE PROGRAMMING (VOLTAGE MODE)
3.7
CONSTANT CURRENT OPERATION
JQE special power supplies will deliver constant current depending on the output voltage and
output current limit settings as well as the load value. In constant current operating mode, the
voltage comparison bridge is interconnected with the internal current sensing resistor, R
S
, and a
current control, R
CC
(as shown in Figure ) to maintain a constant voltage drop across R
S
. In this
way, an adjustable constant load current is obtained. Characteristic of the constant current sup-
ply is ability to change its output voltage automatically in order to maintain a constant current
through a range of possible load resistances. The range of output voltage that the supply can
deliver and simultaneously maintain constant current, is referred to as the “COMPLIANCE
VOLTAGE.”
Ib
EOnom V
〈 〉
RVCext FS (Kohms)
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