Altek Model 40A Frequency Source Manual

							Frequency Source
Model 40A
• Frequency output40 precise steps 0.5 Hz to 60 KHz
• Tuning fork crystal0.0008% accuracy
• Laboratory stability±0.001% per deg C
• Zero based & zero crossing square waveSwitch selected outputs
• Pocket sized
Altek Model 40A Frequency Source provides 40
precise frequencies from 0.5 to 60,000 Hertz. Output
is a square wave* of 15 volt peak-to-peak amplitude
which can be set to any lower value with a built-in
attenuator. A switch selects zero based or zero center
outputs for standard or zero crossing inputs.
The Model 40A checks and calibrates the electronics
of turbine meters, vortex shedding meters, positive
displacement meters, oscilloscopes, electronic
counters, tachometers and many other frequency
input devices. LED flashes to calibrate optical and
fiber optic devices.
Frequency accuracy is ±8 parts per million. Long term 
stability is ±3 parts per million per year.
Instant turn-on allows long life from the two 9 volt
alkaline batteries (200 hours continuous). Frequency
is adjusted with the 8 position frequency selector
switch and a 5 position range multiplier switch.
The low cost Model 40A is a complete, compact
source for checkout and calibration of all frequency
instruments in the field, shop, lab and control room.
General description
*20 KHz = 1:3 ratio     
12 KHz = 2:5 ratio 
						

							PN 1887794 Rev A April 2002
©2002 Altek Industries, Inc. Specifications subject to change without notice. 
All rights reserved. Printed in U.S.A.  
Altek products are warranted to be free from defects
in material and workmanship (excluding fuses,
batteries and leads) for a period of three years from
the date of shipment. Warranty repairs can be
obtained by returning the equipment prepaid to our
factory. Products will be replaced, repaired, or
adjusted at our option. Altek gives no other
warranties, including any implied warranty of fitness
for a particular purpose.Also, Altek shall not be liable
for any special, indirect, incidental or consequential
damages or losses arising from the sale or use of its
products.
Warranty
(Unless otherwise indicated, specifications are at 23°C)
Accuracy: ±0.0008% (8 parts per million)
Frequencies: 5, 6, 10, 12, 15, 20, 30 and 60 Hz times multiplier
Multiplier: 0.1, 1, 10, 100 and 1000 times frequency scale
Output: Nominal 15V peak-to-peak square wave (1:3 ratio 20KHz,
2:5 ratio 12KHz)
Waveform: Switch selected zero based or zero crossing squarewave
Attenuator: Sliding potentiometer, logarithmic taper
Output impedance: 2500 ohms maximum
Output drive current: 6mA at max output voltage
Rise time: 1 microsecond nominal into resistive load
Operating temperature range: 14 to 158° F 
(-10 to +70°C)
Storage temperature range: -22 to +185° F (-30 to +85°C)
Temperature effect: ±0.001%/°C
Batteries: 2 x 9-volt Alkaline
Battery life: Nominal 200 hours of operation. Batteries should be
removed when storing the unit for >3 months.
Battery indication: LED flashes with frequency if batteries OK
Size: 2-1/8 x 4 x 2-1/4 inches (54x102x55mm)
Weight: 7 oz. (0.2 kg)
Specifications
Multiplier
Switch Output frequency
0.1 0.5 0.6 1 1.2 1.5 2 3 6
1 5 6 101215203060
10 50 60 100 120 150 200 300 600
100 500 600 1K 1.2K 1.5K 2K 3K 6K
1000 5K 6K 10K 12K 15K 20K 30K 60K
5 6 10 12 15 20 30 60
Hx (x Multiplier) Switch
Connect the Model 40A to the frequency input of the
device to be checked or calibrated. Select the
frequency and multiplier for the initial frequency
desired. Turn the power switch “on” and observe the
glow in the light emitting diode (LED).
If the diode glows, the battery is at a sufficient level to 
provide proper operation. At low frequencies, the LED
flashes in synchronism with the selected frequency.
Adjust the attenuator for proper level. Check at all
desired frequencies, turn off and disconnect the
Model 40A.
Operating instructions
RECEIVER
FREQUENCY
INPUT ALTEK
40A