The Model 428P Portable Clip-on Milliammeter System is an accurate, sensitive ammeter
that is designed to measure small currents without breaking or interrupting the current flow
in a circuit. The current probe can be clipped onto wires up to 0.160" diameter; system
accuracy is not affected by wire size. Three full scale AC and DC ranges are available:
20 mA, 200 mA and 2 Amp. These ranges may be selected manually or by an autorange mode. On the
most sensitive range, currents down to 20 µA can be measured. The inclusion of an autozero
option eliminates the need to manually zero the meter.
The Model 428P measures current flow in a wire by sensing the magnetic field surrounding
the wire. The measured current is displayed on a 3½ digit liquid crystal display (LCD). For
nighttime viewing, a backlight for the LCD display can be turned on.
Battery operation capability, water resistant design and rugged construction make the Model
428P ideal for field applications.
Options
An axial magnetometer probe is available as a system option, enabling measurement of magnetic fields from 1 µG to 2 G. When using this probe, the three full scale ranges correspond to 20 mG, 200 mG and 2 G. The system noise level with the magnetometer probe is 10-6 G rms/root Hz.
The Model 428P Portable Clip-on Milliammeter System is an accurate, sensitive ammeter
that is designed to measure small currents without breaking or interrupting the current flow
in a circuit. The current probe can be clipped onto wires up to 0.160" diameter; system
accuracy is not affected by wire size. Three full scale AC and DC ranges are available:
20 mA, 200 mA and 2 Amp. These ranges may be selected manually or by an autorange mode. On the
most sensitive range, currents down to 20 µA can be measured. The inclusion of an autozero
option eliminates the need to manually zero the meter.