Altek 942 User 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
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.
General description

Altek 942 Specifications

Summary

Altek Frequency Calibrator Model 942 General Description

Calibrate Turbine Meters and Frequency Devices

Calibrate turbine meters, frequency counters, vibration systems, tachometers, and vortex shedders.

Measure Wide Range of Frequencies

Measure from 0.01 Hz to 250.00 KHz, including slow signals using CPM & CPH.

Function Generator for Simulation

Select sine wave outputs and square waves to simulate various pickups and flowmeters.

Calibrate Totalizers and Batch Systems

Calibrate totalizers by outputting an adjustable number of pulses over a set time.

Altek Model 942 General Instructions and Troubleshooting

Model 942 Turn-On and Operation

Procedure for powering on the Model 942, initial display, and mode selection.

Battery Replacement and Unit Reset

Instructions for changing batteries and resetting the unit to factory defaults.

Field and Bench Use Features

Utilizing the carrying case and tilt stand/hanger for versatile deployment.

Troubleshooting Frequency Readings

Solutions for common issues encountered when reading frequencies.

Troubleshooting Sourcing Frequency

Solutions for common issues when sourcing frequencies, such as lack of response.

Altek Model 942 Frequency Output and Read Operations

Frequency Output Mode

How to set the Altek 942 to source signals, adjust level, and store values.

Quik-Chek Stored Value Recall

Using the Quik-Chek switch to instantly recall stored frequency values.

Frequency Read Mode Setup

Steps to configure the Model 942 for measuring input frequency signals.

Min/Max Frequency Measurement

How to view the maximum and minimum frequencies measured.

Adjusting Trigger Level for Accuracy

How to adjust the trigger level for precise signal measurements.

Indicating Out of Range Signals

How the display indicates when signals are outside the selected range.

Altek Model 942 Totalizer Calibration and Counting

Calibrate Totalizers with Output Pulses

Procedure to set time and count for calibrating totalizers using output pulses.

Totalize Mode for Counting Pulses

How to set up the Model 942 to count incoming pulses from a device.

Restarting Totalizer Counting

How to restart the totalizer counting process after it has stopped.

Changing Totalizer Settings

How to adjust time and count settings before starting pulse counting.

Altek Model 942 Specifications and Ordering

General and Read Specifications

Key operating parameters, frequency stability, battery life, and read accuracy.

Source and Frequency Range Specifications

Details on source accuracy, waveforms, output amplitude, and available frequency ranges.

Product Warranty Information

Details regarding the three-year warranty for Altek products.

Ordering Information and Part Numbers

Information on product models, part numbers, and included accessories.