The Model 440 is a sensitive digital picoammeter with
nine ranges from 100 picoamperes to 10 milliamperes
full scale plus 100% overranging.
Stability- Zero drift with time is less than 1 digit
per day; drift with temperature is less than one digit
per °C, making frequent adjustment unnecessary.
Overload Protection. A transient overload of 1000 volts
or a continuous overload of 600 volts at up to 20 mA
will not damage the instrument.
Damping. A front panel DAMPING control provides additional
damping of noisy signals on the 100 nanoampere to
Digital Display. The digital display provides 3 digits
with 0,1 picoampere resolution.
Variable Display Rate. A front panel DISPLAY RATE control
adjusts from 24 readings/sec. to 2 readings/minute
to accommodate the mode of data retrieval.
Optional BCD Output and Control Lines. Model 4401 Printer
Output Cards are available as an accessory for factory
or user installation. This option provides BCD outputs
for significant digits, range , polarity, zero check,
and overrange. Various remote control lines are also
provided. The Output Buffer cards are easily inserted
into prewired, prenmounted, card-edge connectors
on the Model 440 chassis.