The Fluke 45 is a highly versatile, feature-rich 5-digit benchtop dual-display digital multimeter capable of 100,000 counts. Designed for manufacturing test, depot, field service, and R&D applications, it features a multifunction vacuum fluorescent display that allows users to simultaneously view two different parameters of the same signal from a single connection. The instrument supports 16 measurement capabilities, true RMS AC and AC+DC readings, and includes RS-232 as standard with optional IEEE-488.2 connectivity.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | RS-232 (standard), IEEE-488.2 (optional) |
| Display | Multifunction vacuum fluorescent dual display, 5-digit, 100,000 counts |
Physical
| Parameter | Value |
|---|---|
| Power Supply | 90 to 264 VAC, 50/60 Hz; optional internal rechargeable battery |
| Operating Temperature | 0 to 50 |
| Dimensions (W×H×D) | 216 × 93 × 286 |
| Weight | 2.4 |
General Specifications
| Parameter | Value |
|---|---|
| Display Type | Vacuum Fluorescent Display (VFD), Dual Display |
| Display Resolution (Digits) | 5 digits (100,000 counts) |
| Measurement Speed/Reading Rate | 2.5, 5, or 20 readings/s |
| True RMS Measurement Type | AC, AC+DC |
| Calibration Interval | 1 Year |
DC Voltage Specifications
| Parameter | Value |
|---|---|
| DCV Ranges | 300 mV, 3 V, 30 V, 300 V, 1000 V |
| DCV Maximum Resolution | 1 µV |
| DCV Basic Accuracy (1 Year) | ±(0.025% of reading + 2 digits) (Slow rate) |
| DCV Input Impedance | 10 MΩ |
| DCV Maximum Input Voltage | 1000 V DC |
| Common Mode Rejection Ratio (CMRR) | > 120 dB at DC |
| Normal Mode Rejection Ratio (NMRR) | > 60 dB at 50/60 Hz |
AC Voltage Specifications
| Parameter | Value |
|---|---|
| ACV Ranges | 300 mV, 3 V, 30 V, 300 V, 750 V |
| ACV Maximum Resolution | 1 µV |
| ACV Bandwidth / Frequency Range | 20 Hz to 100 kHz |
| ACV Basic Accuracy (1 Year) | ±(0.2% of reading + 10 digits) (45 Hz to 20 kHz, Slow rate) |
| ACV Input Impedance | 1 MΩ in parallel with < 100 pF |
| ACV Maximum Input Voltage | 750 V rms, 1000 V peak |
| ACV Common Mode Rejection Ratio (CMRR) | > 90 dB at DC to 60 Hz |
DC Current Specifications
| Parameter | Value |
|---|---|
| DCI Ranges | 30 mA, 100 mA, 10 A |
| DCI Maximum Resolution | 0.1 µA |
| DCI Basic Accuracy (1 Year) | ±(0.05% of reading + 2 digits) (30 mA to 100 mA ranges) |
| DCI Maximum Input Current | 10 A |
AC Current Specifications
| Parameter | Value |
|---|---|
| ACI Maximum Resolution | 0.1 µA |
| ACI Bandwidth / Frequency Range | 20 Hz to 20 kHz |
| ACI Maximum Input Current | 10 A |
Resistance Specifications
| Parameter | Value |
|---|---|
| Resistance Ranges | 300 Ω, 3 kΩ, 30 kΩ, 300 kΩ, 3 MΩ, 30 MΩ, 100 MΩ |
| Resistance Maximum Resolution | 1 mΩ |
| Resistance Basic Accuracy (1 Year) | ±(0.05% of reading + 2 digits) (300 Ω to 300 kΩ ranges) |
| Measurement Method (2-Wire / 4-Wire) | 2-Wire |
Frequency and Period Specifications
| Parameter | Value |
|---|---|
| Frequency Range | 5 Hz to 1 MHz |
| Frequency Resolution | 0.01 Hz |
| Frequency Accuracy | ±(0.05% of reading + 1 digit) |
Diode and Continuity Testing
| Parameter | Value |
|---|---|
| Audible Alarm Indicator | Yes |
Math and Advanced Functions
| Parameter | Value |
|---|---|
| Statistical Functions (MIN/MAX/AVG) | MIN/MAX mode |
| Null / Relative Mode | Yes (RELATIVE) |
| Limit Testing / Compare | Compare (Hi/Lo/Pass) |
| dB / dBm Function | Yes |
| dBm Reference Impedances | 2 Ω to 8000 Ω (21 selectable reference impedances) |
Connectivity and Control Interfaces
| Parameter | Value |
|---|---|
| Standard Data Interfaces | RS-232 |
| Baud Rate Settings | 300 to 9600 baud |
Environmental and Safety Specifications
| Parameter | Value |
|---|---|
| Storage Temperature Range | -40 °C to +70 °C |
Power Requirements
| Parameter | Value |
|---|---|
| AC Line Voltage | 90 V to 264 V AC |
| Maximum Power Consumption | 15 VA |
| Battery Operation Option | Optional internal rechargeable lead-acid battery |
| Battery Life (Typical) | 8 hours |
Physical Characteristics
| Parameter | Value |
|---|---|
| Rack Mount Compatibility | Optional rack-mount kit available |
Inputs & Protection
| Parameter | Value |
|---|---|
| Maximum Common Mode Voltage | 1000V dc or peak ac (COM to Earth ground) |
AC Performance
| Parameter | Value |
|---|---|
| AC Crest Factor | 3.0 at full scale |
Diode Test
| Parameter | Value |
|---|---|
| Diode Test Range | 3.2 V |
Environmental
| Parameter | Value |
|---|---|
| Temperature Coefficient | 0.1 × (specified accuracy) / °C (< 18 °C or > 28 °C) |
| Operating Relative Humidity | Up to 90% (0 °C to 28 °C); Up to 80% (28 °C to 40 °C); Up to 70% (40 °C to 50 °C) |
Compliance & Certifications
| Parameter | Value |
|---|---|
| Safety Compliance | UL 1244, IEC 348, CSA C22.2 No. 231 |
| Electromagnetic Interference (EMI) | FCC Part 15 Class B, VDE 0871 Class B |
Performance
| Parameter | Value |
|---|---|
| Warm-Up Time | 30 minutes to rated accuracy |
Measurement Features
| Parameter | Value |
|---|---|
| Touch Hold | Yes (captures and holds stable readings) |
Power
| Parameter | Value |
|---|---|
| Optional Battery Type | 8V Sealed Lead-Acid |
Technology
Digital Multimeter (DMM)
Applications
Benchtop test, manufacturing test, depot and field service, R&D