Autoranging/Manual Range Selection; Relative Mode; Display Backlight - Extech Instruments TK505 User Manual

FREQUENCY SENSITIVITY (ELECTRICAL)
The frequency sensitivity is range dependent when the function is selected from while in
the voltage or current measuring function. Below are typical sensitivities for the "electrical"
measurement modes.
Range
( DC/AC )
4V
40V, 400V
1000V/1000V
400mA
10A

AUTORANGING/MANUAL RANGE SELECTION

When the meter is first turned on, it automatically goes into Autoranging. This automatically
selects the best range for the measurements being made and is generally the best mode
for most measurements. For measurement situations requiring that a range be manually
selected, perform the following:
1. Press the RANGE key. The "Auto" display indicator will turn off.
2. Press the RANGE key to step through the available ranges. Observe the decimal point
and units displayed until the preferred range is located.
3. To exit the Manual Ranging mode and return to Autoranging, press and hold the RANGE
key for 2 seconds.
Note: Manual ranging does not apply for the Capacitance and Frequency functions.

RELATIVE MODE

The relative measurement feature allows you to make measurements relative to a stored
zero reference value. A reference voltage, current, etc. can be stored and measurements
made in comparison to that value. The displayed value is the difference between the
reference value and the measured value.
1. Perform the measurement as described in the operating instructions.
2. Press the REL button to store (zero) the reading in the display and the "REL" indicator
will appear on the display.
3. The display will now indicate the difference between the stored value and the measured
value.
4. Press the REL button to exit the relative mode.
Note: The Relative function does not operate in the Frequency function.

DISPLAY BACKLIGHT

Press the backlight
backlight off.
HOLD
The hold function freezes the reading in the display. Press the HOLD key momentarily to
activate or to exit the HOLD function.
AUTO POWER OFF
The auto off feature will turn the meter off after 30 minutes. To disable the auto power off
feature, hold down the MODE button and turn the meter on.
LOW BATTERY INDICATION
The icon will appear in the display when the battery voltage becomes low. Replace the
battery when this appears.
Sensitivity
≥ 1.5V rms
≥ 10V rms
≥ 20V rms
≥ 420V rms
≥ 45mA rms
≥ 4A rms
button for >2 second to turn on. Press the button again to turn the
9
Frequency width
5Hz~10kHz
5Hz~20kHz
5Hz~200kHz
50Hz~1kHz
5Hz~5kHz
5Hz~1kHz
EX505 V6.1 11/07