SIMPLIFIED INSTRUCTIONS
AUTO OFF: Removes power after 30-45 minutes; only when battery operated. Auto off defeated when operated from external power. TO RESET: switch "Off" then back to desired range.
FREQUENCY MEASUREMENT: 1. Insure "Read" button is out. 2 Select range and signal connection, using guide below. 3. Read frequency on LCD.
1 Meg/Probe	50 ohm/Probe	Pickup Loop
Signal	Direct	ISO	Direct	50/1 Megohm
Audio				
Digital Pulse			•	(ECL)	
Digital Sq. Wave			•	(ECL)	
RF Oscillators				
Transmitter Outputs				
SENSITIVITY: Leave "Sensitivity" at "Max" for most signals. Reduce if necessary to obtain stable reading on noisy signals.
GATE TIME: Use fast "Gate Time" for fast display update. Use "Slow Gate Time" for maximum resolution.
RATIO: 1. Connect to first frequency. 2. Press "Store" button until
moves through display. 3. Connect to second frequency, 4. Press 'Read'' button. Display shows ratio of frequencies: " = 2nd frequency smaller than 1st, " x " = 2nd frequency is larger than 1st. 5. Push "Store" button with "Read" button locked-in to recall 1st frequency.
CRYSTAL: 1. Set function switch to "Crystal". 2. insert crystal into "Crystal Check" socket. 3. Display is approximate fundamental frequency. Exact crystal frequency varies with circuit.
TEMPERATURE RANGE: No warm-up time is needed. Accuracy over temperature is:
2 0 ppm
 
0 5 ppm
10
PpM
- 25'C - 10"C 0°C
SPECIAL DISPLAY FUNCTIONS: "FC" • Battery is 75% or more of full charge.
"LO" - Battery is 25% or less of full charge (unit shuts off if voltage too low for reliable operation) "FUSE Bad" - Internal 50 ohm input protection fuse is open. Check for excessive level before replacing fuse. Fuse Replacement: 1. Remove case by removing 4 screws, 2 on each side. 2. Replace fuse with spare. (see diagram) 3. Replace case and screws.
40`C 50°C
 
BATTERY
66K258
Imagel2.jpg