The Model 428D Clip-on AC/DC Milliammeter System is intended for use in applications where
current measurements without breaking the circuit are required. The probe can be clipped onto
wires up to 0.160" diameter; system accuracy is not affected by wire size. Four full
scale pushbutton selectable ranges are available: 10mA, 100mA, 1 Amp and 10 Amp. On the most
sensitive range, currents down to 20 µA can be measured.
A precision full scale dc offset capability is included, enabling the measurement of small AC
or DC current changes in the presence of a DC current up to 10A.
System output can be monitored at a front panel BNC connector enabling measurement of signals
over a wide bandwidth of 0 to 600 HZ in the DC mode and 20 to 600 Hz in the AC mode.
The Model 428D Console features a bright 4½ digit LED display and is 100% compatible
with clip-on current probes and magnetometer probes supplied by Hewlett Packard with their 428A
and 428B systems over the last 35 years.
Three magnetic field measuring probes are available as system options. One of these probes
enables transverse fields to be measured and the other two can be used for axial field
measurements. When using these probes, the four fullscale ranges correspond to 10 mG, 100 mG,
1G and 10G. The system noise level with the magnetometer probes is 10-6 G rms/Hz
½.
The Model 428D Clip-on AC/DC Milliammeter System is intended for use in applications where
current measurements without breaking the circuit are required. The probe can be clipped onto
wires up to 0.160" diameter; system accuracy is not affected by wire size. Four full
scale pushbutton selectable ranges are available: 10mA, 100mA, 1 Amp and 10 Amp. On the most
sensitive range, currents down to 20 µA can be measured.