Agilent Technologies 6680A, 6684A, 6683A, 6681A, 6682A service manual Electronic Load

Table 2-1. Test Equipment Required

Type	Required Characteristics	Recommended Model
Digital Voltmeter1	Resolution: 10 nV @ 1V	Agilent 3458A
	Readout: 8 1/2 digits
	Accuracy: 20 ppm
Current Monitor Resistor1	Agilent 6682A, 6683A, Agilent 6684A:	Guildline 9230/300
	0.001Ω ± 0.04%, 300A, 100W
	Agilent 6680A, 6681A	Burster Type 1280
	100 ∝Ω ± 0.05%, 1000A
DC Power Supply	DC Power Source with current capability	Agilent 6680A
	equal to UUT
Electronic Load	Range: Voltage and current range must	3 each Agilent 6050A, w/3 each
	exceed that of supply under test. Power:	Agilent 60504B per Agilent 6050A
	5.4KW minimum	for all units
	or
Resistor Load	5 Kilowatt minimum
	Agilent 6680A = 5.7 milliohms 4375W
	Agilent 6681A = 13.8 milliohms 4640W
	Agilent 6682A = 87.5 milliohms. 5040W
	Agilent 6683A = 200 milliohms 5120W
	Agilent 6684A = 312 milliohms 5120W
Oscilloscope	Sensitivity: 1mV	Agilent 54504A
	Bandwidth Limit: 20MHz
	Probe: 1:1 with RF tip
RMS Voltmeter	True RMS Bandwidth: 20MHz	Agilent 3400B
	Sensitivity: 100 ∝V
Current Transformer	0.1Volt per ampere: 1Hz to 20MHz	Pearson Model 411
Variable-Voltage	Power: 3 Phase 24KVA; Range:	Superior Powerstat
Transformer (AC Source)	180-235V 47 - 63Hz; 360- 440V	1156DT-3Y, 0-280V, 50A,
	47 - 63Hz	24.2 KVA or equivalent .
GPIB Controller2	Full GPIB capabilities	HP Series 200/300

1 Required for Operation Verification Tests.

2 Required for remote testing of 668xA models.

Electronic Load

Many of the test procedures require the use of a variable load capable of dissipating the required power. If a variable resistor is used, switches must be used for connecting, disconnecting, and shorting the load resistor. For most tests, an electronic load (see Table 2-1) is easier to use than a variable resistor. However, an electronic load may not be fast enough for testing transient recovery time or may be too noisy for testing noise (PARD). In these cases, fixed load resistors of suitable power dissipation can be used with minor changes to the test procedures given in this chapter.

12 Verification