Heathkit Model IM-2410

Frequency Counter

Calibration Procedure

Ancillary Equipment Needed

Frequency Counter

RF Generator

Laboratory Standard Frequency Source

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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.