Heathkit Model IM-2410

Frequency Counter


Calibration Procedure

 

Ancillary Equipment Needed

 

Frequency Counter

RF Generator

Laboratory Standard Frequency Source


* * * * * * *

WITHOUT INSTRUMENTS

Refer to PICTORIAL 7-1

Manual page 39

 

( ) Set the POWER switch to the ON position

(Allow the unit to warm up for 30 minutes)

 

( ) Adjust the trimmer capacitor C27 through the OSC ADJ hole [on rear of unit] until the metalized half of the trimmer is on the left (see PICTORIAL 7-1).

 

( ) Calibration procedure is complete.


* * * * * * *

WITH CALIBRATED INSTRUMENTS

Refer to PICTORIAL 7-2

Illustration booklet page 6


( ) Set the POWER switch to the ON position

(Allow the unit to warm up for 30 minutes)

 

( ) Set the GATE switch SW2 to the 1 SEC position.

 

( ) Set the FREQUENCY RANGE SWITCH sw3 TO THE 10 Hz to 50 MHz.

 

Using a Frequency Counter and an RF Signal Generator

 

( ) Connect the RF Generator, reference Frequency Counter, and the Frequency Counter being calibrated as shown in Figure 5.

 

( ) Set the RF Generator output frequency between 1 MHz and 50 MHz.

 

( ) Set the RF Generator output voltage between 250 mV and 500 mV.

 

( ) Adjust the oscillator trimmer C27 through OSC ADJ hole on rear panel using a non-conducting alignment tool until the IM-2410 counter reading matches the reference counter reading.

( ) Calibration procedure is complete.

 

Using a Known Laboratory Standard Frequency

 

( ) Known laboratory standard frequency should be between 1 MHz and 50 MHz

 

( ) Known laboratory standard frequency output voltage should be between 250 mV and 500 mV.

 

( ) Connect the known laboratory standard frequency to the IM-2410.

 

( ) Set the RF Generator output frequency between 1 MHz and 30 MHz

 

( ) Adjust the oscillator trimmer C27 through OSC ADJ hole on rear panel using a non-conducting alignment tool until the IM-4100 counter reading matches the known laboratory standard frequency.

 

( ) Calibration procedure is complete.