Model 541
Frequency Calibrator
Practical Instrument Electronics
Features
Frequency Read & Source Functions
Accuracy ± 0.005% of range
Source and Read
Six Ranges 1 count per hour to 20.000Khz
Calibrate Totalizer input and outputs from 1 to 99999
Count Pulses 1 to 99999
LED indicator for gate time
Read Function
Read a wide range of Frequencies and Waveforms
Read 50mV to 120V peak
Read signals from Flowmeter pickups, Velocity and
Motion Detectors
Totalizers
Source Function
Sine and Square waves, Zero Based and Zero Crossing
Frequency from 1CPH to 20 KHz
Adjustable amplitude from 100mV to 12Volts peak-to-peak
Simulates Vibration Pickups, Variable Speed Drives and more
Calibrate Totalizers
Output a number of pulses from 1 to 100 minutes
Gate Trigger Indicator
The LED flashes in synch with the output frequency. This
allows easy adjustment of the attenuation for proper gate
triggering.
Full 5 Digit Display
True ±0.005% of range accuracy
Bar graph for quick reference of trigger level and output
levels, 5% of frequency range
High contrast graphic display viewable in all lighting
conditions and angles
EZ-Dial Knob
Change the speed of dialing your test point by just pushing
down on the knob
EZ-Check Switch
Stop watch style push button for accurate totalizer
measurements and for high and low readings
with Totalizer
Uses a standard 9V Alkaline Battery
Superior battery life of 24 hours under typical continuous
usage
Easy access to battery compartment
240 VAC Tolerant
Fuse-less protection from accidental misuse
Lightweight and rugged with a solid feel
Convenient Velcro® hand strap allows for a firm confident
grip or attachment to pipes and ladders.
Practical Instrument Electronics, Inc. Copyright 2003. All rights reserved.
541-9001 2/28/05
1-4
Model 541 Datasheet
The Practical Instrument Electronics’ Model 541 is the best tool for calibration, test, and diagnosing turbine meters, frequency
counters, vibration systems, tachometers, vortex shedders, integrators, and any other Frequency devices in the shop, plant and/or
field. The Model 541 brings all the features you would expect from a frequency calibrator and timesaving new ones. The model 541
comes with an LED indicator showing gate time for easy trigger level adjustment. Make adjustments with the EZ-Dial Knob or test
limits with the dual action EZ-Check Switch. Save hours of troubleshooting time on problems when compared to other calibration
methods. When calibrating a totalizer, the model 541 eliminates the need of a stop watch. This calibrator will automatically stop
when the selected number of pulses has been sent to the totalizer.
General Specifications:
(Unless otherwise indicated all specifications are rated from a nominal 23 °C, 70 % RH for 1 year from calibration)
Operating Temperature Range -20 to 60 °C (-5 to 140 °F)
Storage Temperature Range -30 to 60 °C (-22 to 140 °F)
Relative Humidity Range 10 % ≤RH ≤90 % (0 to 35 °C), Non-condensing
Size 7.00 X 3.30 X 2.21 inches (177.8 x 83.8 x 56.1mm)
Weight 12.0 oz (340 grams)
Battery 9V Alkaline
Miscellaneous Low battery indication with nominal 1 hour of operation left
Common Specifications for all Frequency Modes:
Frequency Ranges 1CPH to 20.000Khz
Accuracy ± 0.005% of range
Temperature Effect ≤ 10ppm/°C of range
Frequency Ranges Specifications:
1 1 CPH< CPH Range < 20000 CPH
2 0.1 CPM (0.0167Hz)< CPM Range < 2000.0 CPM (33.33Hz)
3 0.01Hz < Hz < 200.00Hz
4 0.1Hz < Hz Range < 2000.0Hz
5 0.001KHz < KHz Range < 20.000KHz
6 Totalize inputs/outputs from 1 to 99999 counts in 0.1 minutes to 100.0 minutes
Read Inputs Specifications:
Read x1 attenuation range: 0.1Vpk to 12Vpk
Input Impedance > 1 Meg Ω + 100pF
Adjustable Signal Attenuation Adjustable trigger level with X1 and x10 attenuation ranges
Miscellaneous Battery life ≥ 24 hour typical
Fuse-less protection 240Vrms
Description
Specifications
10 % ≤RH≤ 70 % (35 to 60 °C), Non-condensing
Over-voltage protection to 120 Vrms (rated for 30 seconds) or 240 Vrms (rated for 15
seconds)
High contrast graphic liquid crystal display with 0.45” (11.4 mm) high digits
x10 attenuation range: 1Vpk to 120V peak – Limit of attenuation is 120Vpk
Practical Instrument Electronics, Inc. Copyright 2003. All rights reserved.
541-9001 2/28/05
2-4
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