HP 59501B Operating And Service Manual

Also see for 59501B: Operating and service manual

user must determine the importance of having a roundnumber for resolution when writing programs.3-55 Calibration. To calibrate a.B9501B /power supplycombination for CV operating, proceed as follows:3-56 Test Setup.a. Connect 59501B to ah HP-IB controller.b. Connect 595018 to power supply (CV program-ming}, see Table 3-1.c. Connect DVM between +S and —S terminalson the power supply. ld. On 59501B, set mode switch to UNIPOLARand turn POWER SUPPLY FULL SCALEADJUST (COARSE and FINE) fully CCW.Also, if power supply has a front panelCURRENT control, set it to mid-range (approx.)3-57CalibrationProcedure.a. Apply power to the controller, the 59501B , andthe power supply. Allow-30-minute warm-up.b. With the power supply's output terminals(+ and —) open circuited, program the 595018to maximum high range "2999."c. Adjust POWER SUPPLY FULL SCALEADJUST (COARSE and FINE) on 59501B fordesired maximum output voltage (or 99.996 ofdesired max., see paragraph 3-54) using the DVM.d. Program 59501B.to zero output "2000." `e. Set ZERO ADJUST on 59501B for 0.000.reading on DVM.f. Program 595018 to ‘'2999” and set POWERSUPPLY FULL SCALE FINE ADJUST on .595018 for desired maximum output voltage. -if necessary, use D/A FULL SCALE ADJUSTto obtain the required resolution.NOTEIf the supply has a front panel CURRENTcontrol, perform the following steps.g. Program 59501B to zero output "2000". Con-nect a short across supply's output terminals.h. Program 59501B to "2999" and adjust the sup-ply's front panel CURRENT control for the desi-red maximum output current, If aload change -causes this current limit to be exceeded, thesupply automatically crosses overto constant3-13current operation at this preset current limitand the output voltage drops proportionally. ifdesired, the front panel CURRENT control canbe disabled and replaced with a fixed resistor ofappropriate value (see applicable power supplyOperating and Service Manual).i. Program "2000". Remove short from supply'soutput terminals and connect load.3-58 Sample Program. A sample program for controll-ing power supply CV outputs is given in example 4. Theprogram is written specifically for a 9825A calculator butcould be modified for.use with other calculators. The pro-gram contains calibration and setup routines and allows theoperator to input specific voltage values on the keyboard.The program also includes automatic changing of rangesand error messages that indicate when the voltage re-quested by the operator exceeds the maximum valueavailable or when a negative voltage is requested. A line-by-line explanation is given after the program. Program-ming fundamentals are provided in paragraphs 3-17 through3-34.3-59 The sample program requires use of the GeneralI/O and Extended I/O ROM’s. After keying in the program,press RUN on the calculator. All operations required tocomplete the program are given on the calculator display.After each operation is completed, press CONTINUE. The. operator enters the maximum desired output voltage value(e. g. 20) when "Enter maximum output voltage" appearson the display. The program automatically uses 99.996 ofthis value (e. g. 19.98) to calibrate the supply (see paragraph3-54). After connecting the load, the operator enters thedesired output voltage (line 13) on the keyboard andpress CONTINUE. if it is desired to recalibrate the powersupply (change the maximum desired output voltage) pressSTOP and then press RUN. .NOTE.The program listings provided in the followingexamples are taken from an HP 98668 printer.These listings are provided only because 9866Bprintouts are easier to read than printoutsfrom the 9825A's internal strip printer. Also,a check sum is provided at the end of. each 9825Aprogram listing. Make sure that the check sum atthe end of your keyed-in program matches. thecheck sum provided in the listing.