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TABLE OF CONTENTS
TABLE OF CONTENTS
1.0 OVERVIEW ............................................................................. 1
1.1 Display Panel / Definition of Buttons ........................... 1
2.0 PREPARATION FOR USE ........................................................ 3
2.1 Power ............................................................................ 3
2.2 Input / Output Connections .......................................... 3
3.0 MENU ...................................................................................... 5
4.0 OPERATION ............................................................................ 6
4.1 Internal Mode - Standard Strobe Operation ............... 6
4.2 Internal Mode - TACH Frequency Generator ............... 9
4.3 External Mode - External Input Required .................... 9
4.4 Tachometer Mode - External Input Required ............ 10
4.5 Power Up Features .................................................... 10
5.0 USING THE STROBOSCOPE TO MEASURE RPM ................ 11
6.0 LAMP AND FUSE REPLACEMENT ....................................... 13
6.1 Lamp Replacement .................................................... 13
6.2 Fuse Replacement ..................................................... 15
7.0 BATTERY POWERED MODELS ONLY .................................. 16
7.1 Low Battery Indication ............................................... 16
7.2 Charging the Batteries ............................................... 17
7.3 Battery Disposal ......................................................... 18
8.0 SPECIFICATIONS .................................................................. 18
9.0 OPTIONS AND ACCESSORIES ............................................ 21
19
External Input TTL Compatible (24V pk max), 500 nanosec
min pulse width,
Positive or Negative edge triggered (menu
selectable)
Output Pulse 40 µsec positive/negative pulse (menu
selectable), 3.3 Vdc typical
Note: HHT31R – Input/Output connectors
isolated from AC power
Time Base Ultra Stable Crystal Oscillator
Display LCD display with 6 numeric 0.506 inch [12.85
mm] high digits and
5 alphanumeric 0.282 inch [7.17 mm] high digits
Indicators Battery level, On Target, ALT, TACH, and EXT
icons
Knob Adjustment Digital Rotary switch with 36 detents per
revolution; velocity sensitive
Memory Last setting before power down is remembered
and restored on next power up. 9 user settable
flash rates.
Flash Duration 10-25 microseconds (auto adjust with flash rate)
Flash Tube (Lamp) Life 100 million flashes
This product is designed to be safe for indoor use under the following
conditions (per IEC61010-1).
Operating Temperature 32-104 ºF [0-40 °C]
NOTE: Safety thermal fuse will set unit into TACH Mode (stops
flashing) in the event of internal overheating.
Humidity Maximum relative humidity 80% for temperature
up to 88 °F [31 °C] decreasing linearly to 50%
relative humidity at 104 °F [40 °C]
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