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15.Connect a –10V ±0.1mV d-c reference to pin 8 (S_IN_SERIAL) of the PAR/SER CONTROL
IN connector (A2A5J3) referenced to COM S terminal at the rear panel. Set the BOP to max-
imum positive output voltage by sending CAL:SER MAX. Measure the voltage output using
the DVM. Send CAL:DATA commands as needed (see PAR. 4.3a) until the DVM reading is
as close as possible to +10V.
16.Send CAL:ZERO to prepare for current calibration. After sending the command, the BOP out-
put will be set to zero volts. Refer to Figure 4-2 to connect the C terminals of the Kelvin type
sense resistor to the BOP and connect the DVM to the P (probe) terminals of the sense
resistor ((LO terminal of DVM to common P terminal). Table 4-4 provides recommended
sense resistor values for various BOP current outputs, as well as the formula for calculating
expected measured values and tolerances for any sense resistor other than those recom-
mended. Table 4-2 lists Kepco and Manufacturer part numbers for those sense resistors rec-
ommended.
The sense resistor will be dissipating full rated current of the BOP. If
it is hot to the touch, the sense resistor value, power rating and/or
cooling are incorrect; refer to PAR. 4.3 and Table 4-2.
FIGURE 4-2.
17.Set the BOP to zero volts across the sense resistor (corresponding to zero current) by send-
ing CAL:CURR ZERO. Send CAL:DATA commands as needed (see PAR. 4.3a) until the
reading is as close to zero as possible within the limits specified in Table 4-4 for CURRENT
ZERO.
18.Set the BOP to maximum positive output current by sending CAL:CURR MAX. Measure the
current by reading the voltage across the sense resistor. To adjust, send CAL:DATA com-
mands as needed (see PAR. 4.3b) to adjust the BOP output until the DVM reads as close as
4-8
WARNING
CURRENT SHUNT (SENSE RESISTOR) CONNECTIONS
BOP-1K 080709
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