BOP-1K 031912 4-711. Set the BOP to zero volts output by sending CAL:ZERO. Disconnect the +10V d-c referencevoltage from the analog I/O port external reference pin (A2A5J6 pin 11) of the BOP, thenconnect 0V ±0.1mV d-c reference voltage from the external voltage source to +V_LIM_EXT(pin 14), –V_LIM_EXT (pin 6), +I_LIM–EXT (pin 13) and –I_LIM–EXT (pin 5) referenced topin 12 (GND1) of the BOP analog I/O connector (A2A5J6), then send the CAL:VLIM ZEROcommand. This enables the BOP to recognize that the voltage at the ±VLIM_EXT pins is 0V.12.Set the BOP to zero amperes output by sending CAL:CLIM ZERO. This enables the BOP torecognize that the voltage at the ±I_LIM_EXT pins is 0V. Then send CAL:ZERO command.13.Connect +10.0V ±0.1mV d-c reference voltage from the external voltage source to+V_LIM_EXT (pin 14), –V_LIM_EXT (pin 6), +I_LIM–EXT (pin 13) and –I_LIM–EXT (pin 5)referenced to pin 12 (GND1) of the BOP analog I/O connector (A2A5J6), then sendCAL:VLIM MAX. This enables the BOP to recognize that the voltage at voltage at the±VLIM_EXT pins is 10.0V. Then send CAL:ZERO command.14.Send CAL:CLIM MAX command. This enables the BOP to recognize that the voltage at the+I_LIM_EXT pin is 10.0V. Then send CAL:ZERO command.15.Set the BOP to minimum (maximum negative) output by sending CAL:VLIM MIN com-mand. This enables the BOP to recognize that the voltage at the –VLIM_EXT pin is10.0V. Then send the CAL:ZERO command.16.Set the BOP to minimum (maximum negative) output by sending CAL:CLIM MIN com-mand.This enables the BOP to recognize that the voltage at the –I_LIM_EXT pin is10.0V. Then send the CAL:ZERO command.17.Connect a 0V ±0.1mV d-c reference to pin 8 (S_IN_SERIAL) of the PAR/SER CONTROL INconnector (A2A5J3) referenced to COM S terminal at the rear panel (use mating connectorsupplied with the unit, P/N 142-0488 to gain access to PAR/SER CONTROL IN connectorpins). Set the BOP to zero volts output by sending CAL:SER ZERO. Connect the DVM to theBOP OUT S and OUT COM terminals and send CAL:DATA commands as needed (see PAR.4.3a) to adjust the BOP output until the DVM reads as close to zero as possible within toler-ance specified in Table 4-3 for VOLTAGE ZERO.NOTE: Accuracy of the 10V d-c reference must be ±0.1mV in order for the calibrated unit tomeet published specifications.18.Connect –10V ±0.1mV d-c reference [–6V ±0.1mV d-c reference for BOP 6-125MG] to pin 8(S_IN_SERIAL) of the PAR/SER CONTROL IN connector (A2A5J3) referenced to COM Sterminal at the rear panel. Set the BOP to maximum positive output voltage by sendingCAL:SER MAX. Measure the voltage output using the DVM. Send CAL:DATA commands asneeded (see PAR. 4.3b) until the DVM reading is as close as possible to +10V [+6V for BOP6-125MG].19.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 typesense resistor to the BOP and connect the DVM to the P (probe) terminals of the senseresistor ((LO terminal of DVM to common P terminal). Table 4-4 provides recommendedsense resistor values for various BOP current outputs, as well as the formula for calculatingexpected 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.
