•
Measures current down to 100pA
•
All solid state and IC design
•
Accepts either polarity of input
current.
Digital Nanoammeter, DNM-121, a rugged and low cost instrument, is
a product of extensive R&D using high input impedance integrated
circuits. It has
4 decade ranges with 100% over-ranging
. The unit is
suitable for current measurement in the range of
100pA to 200µA
. For
the ease, readings are directly obtained on a
3½ digit DPM
. The
instrument is capable of accepting either polarity of the input current.
The very low leakage current of the input stage combined with the
high linearity fast response due to high negative feedback enables
accurate and easily reproducible measurements
. The instrument uses
a FET input operational amplifier that offers the
very low input bias
current, low offset voltage, low drift and noise
.
These characteristics have been fully utilized in the present
Nanoammeter. This operational amplifier is used in low level current
to voltage configuration.
Specifications
Range
:
100nA, 1µA, 10µA, 100µA with 100% over-ranging
Accuracy
:
0.2% for all ranges
Resolution
:
0.1nA
Input Resistance
:
25
Ω
, 2.5
Ω
, 0.25
Ω
, 0.025
Ω
Display
:
3½ digit, 7 segment LED (12.5mm height) with auto polarity and decimal
indication
Input
:
Through Amphenol connector
Power Supply
:
110V±10%, 60Hz
Weight
:
2.5Kg
Dimensions
:
240mm X 275mm X 120mm
DIGITAL NANOAMMETER
DNM-121
Applications
To measure current from photomultiplier
tubes, photometer etc.
Leakage currents in solid state devices.
FET gate and tube grid voltages without
loading errors.
Current through very high resistance in
conjunction with a power supply.
Potentials
across
semiconductors,
piezoelectric systems & pH electrodes.
