Continuity is the presence of a complete path for current flow. Logged Readings Memory The logging interval Log Int can be set using the meter or FlukeView Forms. You can improve pulse width stability by selecting the averaging feature. Rotary Switch Turn the meter on by selecting any measurement function identified with white letters around the rotary switch. The ac volts function shown in Figure 2-1 is assumed in the following discussion. You can switch between the two types of memory data.
Most capacitors are in the nanofarad nF to microfarad F range. For most measurement functions, the bar graph updates 40 times per second. A flashing battery icon means that battery failure is imminent. Press again to release the display. In Relative mode, this sign indicates that the present input is less than the stored reference. Pay particular attention to the insulation surrounding the connectors. Press % to select d.
Turn off power to the circuit and discharge all highvoltage capacitors. To select continuity, turn the rotary switch to resistance position, then press the blue button once. If necessary, adjust the temperature offset until the temperature on the primary display matches the temperature indicated by the lag bath thermometer. If you selected no, selections made in the Setup mode become active. Duty Cycle Display For 5 V logic signals, use the 5 V dc range.
Replace the batteries and the battery door. To exit Display Hold mode, press Q again. Remember to place the meter in series with the circuit. New readings now appear in the secondary display. Touch the red probe to the more positiv e side. Additional intervals will be logged up to 995 if the signal is stable.
Remove either fuse by gently prying one end loose, then sliding the fuse out of its bracket. Using Conductance for High Resistance Tests. Remo ve th e ba. To measure conductance, set up the meter as shown in Figure 3-7;then press the blue key until the nS indicator appears on the display. Make an ac volts meas urement to be used as a reference point. Table 2-1 defines all blue button func.
Primary Display The primary display usually shows the present reading for the rotary switch function. When you disconnect test leads, disconnect the live test lead first. From the Setup menu see Chapter 5 , you can specify a maximum period of 23 hours, 59 minutes. When you disconnect test leads, disconnect the live test lead first. Multiple sets of measurement information can be simultaneously displayed at the same time. Setting the Line Main Frequency Although the meter operates on battery power only, it is important to specify the frequency 50 or 60 Hz of the line main power.
This value is already adjusted by any previously stored offset shown in the secondary display. Measuring Frequency Frequency is the number of cycles a signal completes each second. If you are storing the last option, this also exits the setup mode. Additional capabilities with Model 189 are discussed in Chapter 4. You may damage the meter or be injured if the fuse blows during such a measurement. Remove the meter and restore the circuit to normal operation. Upload date: 27 January 2016 Downloads: 518 since 27 January 2016 Information: Calibration Manual Supplement Manual Type: Service Manual Pages: 36 Size: 606.
Current is the flow of electrons through a conductor. Press to start retaining min, max, and average values. Refer to Chapter 5 for additional information. Specifications 7 Detailed Accuracy Specifications Detailed Accuracy Specifications Accuracy is specified for a period of one year after calibration, at 18 ° C to 28 ° C 64 ° F to 82 ° F , with relative humidity to 90 %. Setting value to 00:00 disables timeout.
The meter measures the frequency of a voltage or current s ignal by counting the number of tim es the signal cros ses a thres hold level each s econd. Selecting a higher voltage range might solve this problem by decreasing the sensitivity of the meter. Ot hers are limited to one function or group of func tions. Note Memory, Logging, and Save features apply to the 189 only. Press to freeze the displayed value.
In normal operation 0 zero is on the left. A scheduled logging interval may contain stable and unstable logged readings. Elapsed tim e is e. Press % to select yE5 ; press T to select no. The unit of capacitance is the farad F.