Altek 942 Manual

Frequency Calibrator
with Totalizer
Model 942
• 0.001% accuracy
Locked to high stability crystal
• Six real world ranges
1 to 20000 counts-per-hour
0.1 to 2000.0 counts-per-minute
0.01 to 999.99 Hz
0.1 to 9999.9 Hz
0.001 to 99.999 kHz
0.01 to 250.00 kHz
• Calibrate totalizers and batch systems
Output an adjustable number of pulses
Incremental counter totalizes
• "Quik-Chek ® " switch
Store 18 values for instant recall
Three memories for each range
• Three output waveforms
Sine waves, zero crossing
Square waves, zero based
Square waves, zero crossing
• Simulate and measure dry contacts
Optional dry contact module for relay contacts
General description
Frequency calibrator
Calibrate your turbine meters, frequency counters,
vibration systems, tachometers, vortex shedders, inte-
grators and any other frequency devices in the shop,
plant or field. Measure from 0.01 Hz to 250.00 KHz
with resolution down to 0.01Hz. For your slower
signals, source or measure from 0.1 to 2000.0 counts
per minute (CPM) or from 10 to 20000 counts per
hour (CPH). Quickly indicate process signals, no more
waiting around with stopwatch and calculator.
Read a wide range of frequencies
Use in the field to check the signals from your
flowmeter pickups, velocity and motion detectors, Fre-
quencies can be directly measured from 0.01 Hz to
250.00 KHz in four frequency ranges.
Measure extremely slow frequencies (<1 Hz) with high
resolution using CPM & CPH. Instead of displaying
1/2 Hz as 0.5 Hz (1 digit of resolution) as most with
frequency counters you can display it as 30.0 CPM (3
digits of resolution) or as 1800 CPH (4 digits of
resolution). You can now measure these slow signals
in seconds with the Model 942 instead of many
minutes needed with a totalizer, stopwatch and calcu-
lator. Measure signals from 30 mV to 240 V peak-to-
peak with a minimum pulse width of 2 microseconds.
Function generator
Select sine wave outputs to simulate vibration
pickups, variable speed drives and square waves to
simulate flowmeters and magnetic pickups. Any
frequency from 0.01 Hz to 250.00 KHz can be
sourced in four frequency ranges to calibrate
tachometers, counters, data loggers, turbine meters
and frequency transmitters. For low frequency appli-
cations such as positive displacement flowmeters,
Watt-hour meters, slow rate integrators and assembly
line counting, the Model 942 sources signals as low
as 1 CPH (0.0002777 Hz). Amplitude is adjustable
from 50 millivolts to 12 volts peak-to-peak.
Three "Quik-Chek" output values are remembered for
each range. Turn the knob to check trip points,
controller action and to control variable speed drives.
Memory is retained for each range even when power
is off.
Calibrate totalizers and batch systems
Calibrate your totalizers & integrators faster and more
accurately with the Model 942. Verify totalizer read-
ings by outputting a number of pulses over1 to 99
minutes. The Model 942 will automatically stop when
the selected number of pulses have been sent to the
totalizer. This eliminates waiting several minutes with
a stopwatch to try to catch the total.
You can also use the 942 as a timed totalizer to check
the output rate from your flowmeters or integrators.