INSTRUCTIONAL MANUAL
2750L-P/4500L-P/6000L-P
August, 2001
Rev. K
-57-
Again the ramp must be terminated with the bus "GET" message when the external AC calibration DVM indicates the
correct voltage.
The CAL header is used with the headers VLT, CUR and PWR to calibrate the respective measurement function. An
A, B or C extension follows the headers to designate a specific measurement channel. If the extension is omitted, the
calibration coefficients for all measurement channels will be the same and will depend on only the value for phase A.
The arguments is a numeric value that represents the expected measured value. It should be equal to an external
precision TRMS voltmeter, ammeter or power meter.
The following ASCII string will cause the current measurement for phase A to measure the value indicated by a TRMS
ammeter standard, 10.12 amps:
CAL CUR A 10.12
3.7.10
TO PROGRAM RAMP OR STEP OPERATIONS
The DLY header is used with a parameter that has a numeric argument (ex. AMP, FRQ, PHZ, CRL, CAL) in a single
step program. The numeric argument is in seconds with four decade resolution from 0.001 to 9999 seconds.
The STP header with VAL may be used with DLY to completely specify a ramp program.
The following string will first step the voltage to 125 volts for 2.55 seconds and return to 115 volts.
AMP 125 DLY 2.55 VAL 115
The following string will ramp the voltage from 10 volts to 115 volts with 1.5 volt/.5 sec. steps:
AMP 10 DLY .5 STP 1.5 VAL 115
When an AMP header with an argument of 0 is used, the waveform will stop and drop to zero volts at the point
specified by the PHZ A value.
The following ASCII string will stop the waveform at 0 degrees for .01 seconds and return to 115 volts:
PHZ A 0 AMP 0 DLY .01 VAL 115
The STP header is used to identify a numeric value as the increment or decrement value for a FRQ, CRL, AMP, PHZ
or CAL ramp.
The following example will ramp all outputs from 130 volts in 1.5 volt/.5 sec. steps to 10 volts.
AMP130 DLY.5 STP1.5 VAL10
The header VAL is used to identify the following numeric argument as the final Value of a ramp or step. If the VAL
argument is larger than the initial value for the parameter to be ramped, the ramp will increment with step size defined
by STP and DLY. With the VAL argument less than the initial value, the ramp will decrement from the initial parameter.
A ramp or step operation can be started at anytime by the GPIB message Group Execute Trigger (GET). The operation
will wait for the Group Execute Trigger when the TRG header is added to the string.
The following example will decrement the output amplitude of phase A only from 120 in .1 volt/.2 sec steps to 100 volts
after a Device Trigger.
AMP A 120 DLY.2 STP.1 VAL100 TRG
Summary of Contents for 2750L-P Series
Page 119: ...INSTRUCTIONAL MANUAL 2750L P 4500L P 6000L P August 2001 Rev K 115 Figure 6 1 MODULE LOCATION...
Page 138: ...INSTRUCTIONAL MANUAL 2750L P 4500L P 6000L P August 2001 Rev K 134 Figure 14 EMERGENCY VOLTAGE...
Page 148: ...INSTRUCTIONAL MANUAL 2750L P 4500L P 6000L P August 2001 Rev K 144 FIGURE 2...
