HP BENCH Series User Manual

of the oscilloscope to this same point. Make certain
that the case is not also grounded by some other
means (power line). Connect both oscilloscope in
put leads to the power supply ground terminal and
check that the oscilloscope is not exhibiting a rip
ple or transient due to ground loops, pick-up, or
other means.
5-11 TEST EQUIPMENT REQUIRED
5-12 Table 5-1 lists the test equipment required to
perform the various procedures described in this
Section.
Table 5-1. Test Equipment Required
TYPE
REQUIRED
CHARACTERISTICS
USE
RECOMMENDED
MODEL
Differential
Voltmeter
Sensitivity: ImVfull scale (min.).
Input impedance: 10 megohms (min.).
Measure DC voltages;
calibration procedures
3420 (See Note)
Variable
Voltage
Range: 90-130 volts. Equipped with
voltmeter accurate within 1 volt.
Vary AC input
AC Voltmeter
Accuracy: 2%. Sensitivity: ImV
full scale deflection (min.).
Measure AC voltages and
ripple
403B
Oscilloscope
Sensitivity: lOOpV/cm. Differ
ential input.
Display transient response
waveforms
($)140A plus 1400A
plug-in. 1402A
plug-in for spike
measurements only.
Oscillator
Range: 5Hz to 500KHz. Accuracy:
2%. Output: lOVrms.
Impedance checks
200CD
DC Voltmeter
Accuracy: 1%. Input resistance:
20,000 ohms/volt (min.).
Measure DC voltages
412A
Repetitive
Load Switch
Rate: 60-400Hz, 2|a,sec rise and
fall time.
Measure transient response
See Figure 5-9.
Resistive
Loads
Values: See Paragraph 5-16.
Power supply load resistors
Current Sam
pling Resistor
See R33 in Parts List (Section VI).
Measure current; calibrate
meter
Resistor
IKn. ±1%, 2 watt non-inductive.
Measure impedance
Resistor
100 ohms, ±5%, 10 watt.
Measure impedance
Capacitor
500|j.f, 50WVdc.
Measure impedance
NOTE
A satisfactory substitute for a differen
tial voltmeter is to arrange a reference
voltage source and null detector as
shown in Figure 5-3. The reference
voltage source is adjusted so that the
voltage difference between the supply
being measured and the reference volt
age will have the required resolution
for the measurement being made. The
voltage difference will be a function of
the null detector that is used. Examples
of satisfactory null detectors are: (^419A
null detector, a dc coupled oscilloscope
utilizing differential input, or a 50mv
meter movement with a 100 division
scale. For the latter, a 2mv change in
voltage will result in a meter deflection
of four divisions.
5-2

HP BENCH Series Specifications

General

Brand	HP
Model	BENCH Series
Category	Power Supply
Language	English