5-81CONSTANT VOLTAGE PROGRAMMING CURRENT

5-82 Zero Output Voltage. To calibrate the zero voltage programming accuracy, proceed as directed in Paragraphs 5-83,5-84, 5-85, or 5-86, whichever applies to your particular instrument.

5-83Standard instrument with resistance or unity- gain voltage programming.

a. Connect differential voltmeter between +OUT and -OUT bus bars.

b. If unit is to be used in local programming mode, turn VOLTAGE controls fully counter- clockwise. If unit is to be used in remote programming mode, connect remote programming setup (Figure 3-3or 3-4)and adjust remote resistance or voltage to zero (minimum).

c.Connect decade resistance box between pads of position marked for resistor R110 in “ZERO ADJUST” section of main circuit board (points “A” and “B” in Figure 5-10;also see Figure 7-10).

d. Rotate CURRENT controls fully clockwise and turn on supply.

e . Adjust decade resistance box until dif- ferential voltmeter reads exactly zero volts.

f. Replace decade resistance box with fixed, metal film, 1%, 1/4 or 1/8 watt resistor of same value.

5-84Standard instrument with non-unity gain voltage programming.

a.Perform Steps (a) and (b) in Paragraph

5-83.

b. Solder jumper between “wiper” pad and “+12.4V” pad of position marked for potentiometer R112 in “ZERO ADJUST” section of main circuit board (points “C” and “ D“ in Figure 5-10; also see Figure 7-10).

c. Connect decade resistance box between pads marked for resistor R111 in “ZERO ADJUST” section of main circuit board (points “ E“ and “ F“ in Figure 5-10;also see Figure 7-10).

d. Perform Steps (d) through (f) in Paragraph

5-83.

Figure 5-10.“ZERO ADJUST” Section of Main circuit Board

5-85Option 020 with resistance or unity-gain

TM 11-6625-2958-14&P

voltage programming.

a.Perform Steps (a) and (b) in Paragraph

5-83.

b. Rotate CURRENT controls fully clockwise and turn on supply.

c.If reading on differential 1 voltmeter is not exactly zero volts, adjust potentiometer R113 (la- beled "VOLTAGE ZERO" and accessible through hole in’ rear panel) until reading is exactly zero.

5-86Option 020 with non-unity gain voltage pro- gramming.

a.Perform Steps (a) and (b) in Paragraph

5-83.

b. Rotate CURRENT controls fully clockwise and turn on supply.

c. If reading on differential voltmeter is not exactly zero volts, adjust potentiometer R112 (la- beled “VOLTAGE PROG” and accessible through hole in rear panel) until reading is exactly zero.

5-87 CV Programming Accuracy. To caIibrate the constant voltage programming current, proceed as directed in Paragraphs 5-88or 5-89, whichever applies to your particular instrument.

5-88Standard instrument.

a. Connect 0.1%, 1/8 watt resistor of value shown below between terminals -S and A3 on rear barrier strip.

Model

Value

62596

2K

Ω

 

 

62606

2K

Ω

62616

4K Ω

6268B

8K

Ω

62696

8K

Ω

b. Disconnect strap between terminals Al and A2 on rear barrier strip.

c. Connect differential voltmeter between +OUT and -OUT bus bars.

d. Connect decade resistance box in place of R3 (mounted on standoffs on main circuit board; see Figure 7-10).

e.Rotate CURRENT controls fully clockwise and turn on supply.

f.Adjust decade resistance box until dif- ferential voltmeter indicates exactly maximum rated output voltage.

g.Replace decade resistance box with fixed, composition, 5%, 1/2 watt resistor of same vaIue.

5-89Option 020.

a.Perform Steps (a) through (c) in Paragraph

5-88.

b. Rotate CURRENT controls fully clockwise and turn on supply.

c. Adjust potentiometer R112 (labeled “VOLTAGE PROG” and accessible through hole in rear panel) until differential voltmeter indicates