IM-2410 calibration

[Jim S.]

I have a IM-2410 that I built back during my NRI correspondence course  days. 
The calibration in the book seemed to work and I've used off and on since  
then with no major problems.
 
I recently came into possesion of a 10MHz standard rated at +/- .1 PPM. On  a 
calibrated counter at work it reads 10.000001. Feeding this to my  counter, I 
get a reading of 9.999820 Mhz. Adjustment of the crystal calibrator  cap C27 
only lowers the reading.
 
Does anyone know if I have to increase or decrease the compensation  
capacitance at the counters crystal to bring the reading up to 10.000000  Mhz?

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