HP 428B, Operating And Service Manual, Page: 8 / 52

Model 428B
1
428B SPECIFICATIONS
Table 1-1 Specifications
Current Range:
1 mA to 10 A full-scale, nine ranges.
Accuracy:
± 3% of full-scale ± 0.15 mA, from 0°C to 55°C.
(When instrument is calibrated to probe).
Probe Inductance:
Less than 0.5 µH.
Probe Induced Voltage:
Less than 15 mV peak (worst case at 20 kHz and
harmonics).
Output:
Variable linear output level with switch position
for calibrated 1 V into open circuit (corresponds
to full-scale deflection). 1.5 V Max. into open
circuit in uncalibrated position.
0.73 ± .01 V into 1 k
Ω
in calibrated position.
Noise:
1 mA Range, < 15 mV rms across 1 k
Ω
.
3 mA Range, < 5 mV rms across 1 k
Ω
.
10 mA thru 10 A Ranges, <2 mV rms across 1
k
Ω
.
Frequency Range:
DC to 400 Hz (3 dB point).
AC Rejection:
Signals above 5 Hz with peak value less than
full-scale affect meter accuracy less than 2%.
(Except at 40 kHz carrier frequency and its
harmonics). On the 10 A range, ac peak value is
limited to 4 A.
Probe Insulation:
300 V Max.
AC Power:
115 or 230 V ±10%, 50 to 60 Hz, 71 W.
Operating Temperature:
- 20°C to + 55°C.
Cabinet Mount:
7½" wide, 11½" high, 14½" deep (190,5 x 292,1
x 368,3 mm).
Weight:
Cabinet Mount: Net 19 lbs (8,6 kg);
shipping 24 lbs (10,9 kg).
Rack Mount: Net 24 lbs (10,9 kg); shipping
35 lbs 15,9 kg).
Accessories Available:
-hp- Model 3528A Large Aperture Probe
-hp- Model 3529A Magnetometer Probe
-hp- Model 11035A Output Cable
-hp- Model 10110A Output Adapter
Dimensions:
Rack Mount