Fluke 1521 Uživatelský manuál Strana 26
- Strana / 51
- Tabulka s obsahem
- ŘEŠENÍ PROBLÉMŮ
- KNIHY
Hodnocené. / 5. Na základě hodnocení zákazníků
smaller type to the right of the measurement. The possible units are degrees
Celsius (C), resistance in ohms (Ω), degrees Fahrenheit (F), Kelvin (K), and
degrees Rankine (R). The units can be easily changed by placing the display in
the units setting mode using the MODE button (see Section 7.5).
The lower part of the display has various functions depending on the selected
mode. It has smaller alphanumeric characters. It can be used to display mini
-
mum and maximum measurements, delta(x) measurements, or measurements
stored in memory. It is also used to view and set various operating parameters.
The mode is easily changed using the MODE button. (See details on the vari
-
ous modes beginning with Section 7.)
The display has a backlight that can be switched on for better viewing in dim
light. The backlight is switched on and off by pressing and holding the power
button for three seconds (see Section 6.3 above). Note: The battery dis
-
charges more quickly when the backlight is used.
6.5 Probe
The probe is used to sense temperature. The probe attaches to the 1521 using a
Hart INFO-CON probe connector that plugs into the top of the instrument. The
probe connector must be properly programmed with the correct charac-
teristics of the probe for measurements to be accurate (see Section 6.6).
The 1521 can be used with various types of PRT and thermistor probes:
• ITS-90 calibrated 25Ω or 100Ω PRT
• IEC-751 or DIN-43760 PRT (RTD)
• Callendar-Van Dusen calibrated 100Ω PRT
•
YSI-400 series or equivalent 2252Ω thermistor
•
Steinhart-Hart thermistor polynomial; nominal R(25°C) 2kΩ to 100kΩ
See Section 7.8.8 for details on the various probe types and their programming.
The 1521 cannot be used with thermocouples.
The 1521 can be used with probes having two, three, or four wires. Three wires
allow partial compensation for wire resistance. The 1521 measures three-wire
probes using the following algorithm. It measures the sensor resistance, includ
-
ing the lead resistance in C2. The 1521 then directly measures the resistance in
the C1 lead of the sensor. The 1521 then subtracts the measured C1 lead resis
-
tance from the measured sensor resistance (including the C2 lead resistance) to
obtain the sensor resistance used to calculate temperature. Note: This algorithm
assumes that the lead resistance of C1 and C2 are equal. If C1 and C2 have dif
-
ferent resistance there will be an error in the calculated sensor resistance equal
to this difference. Four wires allow complete rejection of wire resistance and
should be used when the best accuracy is desired. The 1521 wire setting must
be set to match the actual number of wires of the probe (see Section 7.8.14).
1521 Handheld Thermometer Readout
User’s Guide
22
- Handheld Thermometer Readout 1
- User’ s Guide 1
- Rev. 571203 2
- Table of Contents 3
- Figures and Tables 6
- 1.2 Safety Information 8
- Cautions 9
- User’s Guide 10
- 1 Before You Start 11
- Authorized Service Centers 11
- 2 Introduction 12
- Conditions 13
- 3.2 Environmental Conditions 14
- 4 Quick Start 15
- 4.5 Connect the Power Source 16
- 4.6 Switch the Power On 16
- 4.7 Measure Temperature 16
- 5 Parts and Controls 17
- 5.2 Top and Side Features 19
- 5.3 Back Features 20
- 5.4 Internal Features 20
- 5.5 Accessories 21
- 6 General Operation 23
- 6.2 DC Power Source 24
- 6.3 Power Button 25
- 6.4 Display and Backlight 25
- 6.5 Probe 26
- 6.6 INFO-CON Connector 27
- 7 Display Functions 29
- 7.1 Blank Mode 30
- 7.2 Min/Max Mode 31
- 7.3 Hold Mode 31
- 7.4 Delta(x) Mode 31
- 7.5 Units 32
- 7.6 Rate 32
- 7.7 Resolution 32
- 7.8 CAL MODE 33
- 7.8.1 Mtr Due 34
- 7.8.2 Prb Due 34
- 7.8.3 Time 34
- 7.8.4 Passcode 34
- 7.8.5 Date 35
- 7.8.6 Probe Lock 35
- 7.8.7 Prb # 35
- 7.8.8 Prb Type 35
- 7.8.9 ITS-90 36
- 7.8.10 IEC751 37
- 7.8.11 CVD 37
- 7.8.12 YSI-400 38
- 7.8.13 THERM 38
- 7.8.14 Probe Wires 39
- 7.8.15 PCal 39
- 7.8.16 PDue 39
- 7.8.17 Filter 40
- 7.8.18 MCal 40
- 7.8.19 MDue 40
- 7.8.20 CAL1 and CAL2 40
- 8 Communications Interface 41
- 8.2.1 Primary Commands 42
- 8.2.2 Calibration Commands 43
- Communication Command List 45
- 9 Calibration 46
- 10 Maintenance 48
- 11 Troubleshooting 49
- 11.2 CE Comments 50
- CE Comments 51
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